Originally Posted by flo617
oh no, I fly something like a 90%.
About the boom vang, I am embarassed to say that 2 years ago I drilled into the boom to bolt a fitting for the vang. I did not calculate right and although the angle is ok, the distance is only about a fifth of the boom length. I'm worried that would put too much pressure on the mast when tightening it up but I might be worrying for nothing.
The distance along the boom where the vang is mounted, is usually dictated by the distance between the boom and lowest point on the mast where the other end may be mounted.
45 degrees is the most effective angle.
So the normal approach is to mount one end to the mast as low as practical, then mount the other to the boom so as to leave the vang at 45 degrees.
1/5 along the boom does not sound that unreasonable if you did indeed mount the other end as low on the mast as you could.